简介:Anewcompound,Cochinchin(1),togetherwith7,4'-dihydroxyflavone(2),7-hydroxy-4'-methoxyflavane(3),7-hydroxy-3-(4-hydroxybenzyl)chroman(4),4'-hydroxy-2,4-dirnethoxydihydrochalcone(5)and4'-hydroxy-2,4,6-trimethoxydihydrochalcone(6)wasisolatedfromtheresin(trivialname,'dragon'sblood')ofDracaenacochinchinensis(Lour.)S.C.Chert.Thestructureof1waselucidatedonthebasisofspectroscopicdataas(2,3-trans)-6-allyl-2-(3,5-dimethoxyphenyl)-3-(4-hydroxyphenyl)-2,3-dihydrobenzo[1,4]dioxinwhichisanaturalproductpossessinganewframework.
简介:VIEWSFROMTHECHINESEPRESSPopStars'UncharitableCharityJinJuN,LiberationDailyChinesenewspapershaverecentlybeenblastingpopsingers...
简介:In2014,wewitnessedthepolarizationofglobaleconomicgrowtti,aproliferationinthenumberofregionalhotspotsthathadwidespreadrepercussions,incrediblycomplexandzealousbigpowerrelationsandsomeeye-catchingdiplomaticachievementsfromChina.Thisauthorattemptstogiveaforecastofglobaltrendsin2015basedonthedevelopmentsinthepreviousyear.In2014,countriesshowedtheirstrengthsandweaknessesinthepolitico-economicdomain,whiletheglobaleconomygaveapoorperformance.Inthedevelopedworld,theU.S.registeredastrongeconomicrecovery,whereasEuropeandJapanstruggledwithsluggishgrowth.Ofthe
简介:<正>IfirstbegantolearnaboutXi’anfromthreeChinesemenwhowerevisitingscholarsatmyuniversityintheUSA.TheywerestudyingAmericanbusiness,andItutoredtheminEnglishconversationandAmericanculture.Webecamegoodfriendsduringtheirsixmonths’stayinmyhometownofMorgantown,WestVirginia.
简介:Asuiteof27oilsfromtheQinjiatun-QikeshuoilfieldsintheLishuFaultDepressionoftheSongliaoBasinwasanalyzedusingwholeoilgaschromatography.IncombinationwiththerelativedistributionofC27,C28,andC29regularsteranes,detailedgeochemicalanalysesoflighthydrocarbonsinoilsamplesrevealedcrudeoilscharacterizedbythedualinputofloweraquaticorganismsandhigherterrestrialplants.Severallighthydrocarbonindicatorssuggestthattheliquidhydrocarbonshavematuritiesequivalenttovitrinitereflectancesofaround0.78%-0.93%.Thisisconsistentwiththematuritydeter-minationofsteranesC2920S/(20S+20R)andC29ααβ(ααα+αββ).Crudeoilsderivedfromthetwodistinctoilfieldslikelybothhavesourcerocksdepositedinalacustrineenvironmentbasedonlighthydrocarbonparametersandonhighermolecularweighthydrocarbonparameters.Theresultsshowthatlighthydrocarbondataincrudeoilscanprovideimportantinformationforunder-standingthegeochemicalcharacteristicsoftheQinjiatun-Qikeshuoilsduringgeologicevolution.
简介:Anewlignanoside,saikolignanosideA,wasisolatedfromtherootsofBupleurumscorzonerifolium.Itsstructurewasdeterminedas3-methoxy-4-hydroxy-5-[(8'S)-3'-methoxy-4'-hydroxyphenylpropylalcohol]-E-cinnamicalcohol-4-O-β-D-glucopyranosidebymeansofNMRandMSanalysis,acidhydrolysisandopticaldata.
简介:AnewphytoecdysteroidwasisolatedfromtherootofRhaponticumuniflorum.Itsstructurehasbeenshowntobe2,3,20,22-diacetonideajugasterone.
简介:JewelryandpreciousstonesontheworldmarkethaveanannualtransactionvolumeofoverUS$100billion.Since1985,theyhaveenjoyedalargegrowthinexportsfromChina.In1990,theexportvolumewasUS$157million,in1991——US$250million,in1992——US$250million,in1993——US$670millionandin1994——US$750
简介:Inthehistoryofhumanity,therearesomanygreatthinkerscontributingalottoourlives.Ineducationarea,thinkersinbotheasternandwesterncountriesleftsomanymasterpiecestolatergeneration.Arethereanydifferencebetweentheirideasoflearning?WhatmakesthedifferencesbetweenChineselearnerandthosefromwesterncountries?Inthispaper,IwilltrytoexplainthesebycomparetheviewsofepistemologyfromLockeandConfucius.Fromthatwemayfindtheanswer.